誠に（まことに、makotoni）
- truly

The Japanese word 誠に まことに (Makoto ni) primarily functions as an adverb and intensifier, conveying a sense of sincerity, truthfulness, and strong degree. It's often translated as "truly," "really," "very," "indeed," or "sincerely" in English. It emphasizes the truth or the intensity of what is being said. 誠に indicates that the speaker is expressing something with genuine feeling or great emphasis. It can also indicate a high degree or amount.

⚫︎ 誠にありがとうございます。 Translation: Thank you very much. ⚫︎ 誠に申し訳ございません。 Translation: I am truly sorry. / I sincerely apologize. ⚫︎ 誠に美しい景色ですね。 Translation: It's a truly beautiful scenery, isn't it?

⚫︎ 誠に is used in formal situations and polite contexts, such as business correspondence, customer service, and formal speeches. ⚫︎ It's appropriate when expressing apologies, gratitude, or strong agreement. ⚫︎ Avoid using it in casual conversations with close friends or family. ⚫︎ It is generally used at the beginning of a sentence to emphasize the feeling.

⚫︎ 誠に is typically written in kanji 誠 and hiragana に. ⚫︎ The reading is まことに (Makoto ni). ⚫︎ There are no other common ways to write this word. ⚫︎ Okurigana (the suffix hiragana) is fixed as に.

⚫︎ 本当に (ほんとうに) - Really; Truly ⚫︎ 非常に (ひじょうに) - Very; Extremely ⚫︎ 大変 (たいへん) - Very; Seriously; Greatly ⚫︎ 本当 (ほんとう) - Truth; Reality ⚫︎ 非常に (ひじょう) - Very; Extremely ⚫︎ 心から (こころから) - From the heart; Sincerely ⚫︎ 実に (じつに) - Truly; Indeed

There aren't direct antonyms for 誠に as it expresses a degree of truth or intensity. However, words expressing insincerity or a lack of truth could be considered opposite in meaning.

誠に恐れ入りますが、もう一度説明をお願いできますでしょうか。 ・Translation: I am truly sorry, but could you explain it one more time? ・Explanation: This sentence utilizes 誠に to express the speaker's politeness and sincerity in requesting a repetition of the explanation.

この度は、誠にご迷惑をおかけしてしまいましたことを、深くお詫び申し上げます。 ・Translation: We sincerely apologize for any inconvenience caused. ・Explanation: This sentence is used when offering a deep apology in a formal setting. 誠に emphasizes the sincerity of the apology.

The kanji 誠 (makoto) has the meaning of sincerity, honesty, and truth. The particle に (ni) is a grammatical particle, which changes the word's part of speech. Combining these characters forms the adverb 誠に, meaning "truly" or "sincerely."